The generalised NMSSM at one loop: fine tuning and phenomenology

TL;DR

This paper analyzes a generalized NMSSM model derived from Z4 or Z8 R symmetry, showing it requires less fine tuning than MSSM and NMSSM, with implications for Higgs mass and LHC phenomenology.

Contribution

It introduces a generalized NMSSM framework with reduced fine tuning and explores its phenomenological implications at the LHC and in dark matter detection.

Findings

Fine tuning is significantly less than in MSSM and NMSSM.

Acceptable Higgs masses extend up to ~130 GeV.

Light singlet states can lead to distinctive collider signatures.

Abstract

We determine the degree of fine tuning needed in a generalised version of the NMSSM that follows from an underlying Z4 or Z8 R symmetry. We find that it is significantly less than is found in the MSSM or NMSSM and extends the range of Higgs mass that have acceptable fine tuning up to Higgs masses of mh ~ 130 GeV. For universal boundary conditions analogous to the CMSSM the phenomenology is rather MSSM like with the singlet states typically rather heavy. For more general boundary conditions the singlet states can be light, leading to interesting signatures at the LHC and direct detection experiments.